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Texas Instruments 74AVCH2T45DCTTG4
- Part No.:
- 74AVCH2T45DCTTG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74AVCH2T45DCTTG4.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:1,857
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Product details
Overview
74AVCH2T45DCTTG4 from Texas Instruments is a 2-bit, dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V–3.6V domains (e.g., 1.8V ↔ 3.3V), with 3-state outputs, active bus-hold on all data inputs, and VCCA/VCCB isolation. It supports up to 500Mbps data rate in 1.8V→3.3V mode and operates across –40°C to +85°C for smartphone I/O bridging and server memory interface applications.
For engineers reviewing the 74AVCH2T45DCTTG4 datasheet, 74AVCH2T45DCTTG4 pinout, 74AVCH2T45DCTTG4 application, or 74AVCH2T45DCTTG4 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.2–3.6V), 4.6V I/O tolerance, partial power-down (Ioff), and NanoFree™ DCT package compatibility with high-density portable PCB layouts.
Technical Context
The 74AVCH2T45DCTTG4 implements asynchronous bidirectional data flow controlled solely by the DIR input referenced to VCCA - low enables B→A transmission, high enables A→B transmission. Its two independent supply rails allow simultaneous operation at mismatched voltages (e.g., VCCA = 1.8V, VCCB = 3.3V), with level-shifted output logic levels strictly tracking their respective VCC rail.
Active bus-hold circuitry maintains valid logic states on un-driven A1/A2/B1/B2 inputs without external resistors, while VCC isolation forces both ports into high-impedance when either VCCA or VCCB = GND. The Ioff specification (±5µA max) ensures safe back-current blocking during partial power-down sequences in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables universal translation among 1.2V/1.5V/1.8V/2.5V/3.3V logic domains |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interconnects in mobile SoC-to-peripheral links |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with legacy 3.3V or 5V-tolerant signals without clamping diodes |
| Ioff Current | ±5µA max - prevents damaging backflow current when one supply is powered down |
| Bus-Hold Current | ±100µA min sustaining - eliminates need for external pull resistors on floating data lines |
| Propagation Delay | 2.4ns typical (A→B, VCCA=3.3V/VCCB=3.3V) - meets timing budgets in sub-ns-critical DDR control paths |
| ESD Rating | ±8kV HBM - satisfies IEC 61000-4-2 Level 4 system-level ESD robustness requirements |
Pinout & Package
74AVCH2T45DCTTG4 uses the DCT package: 8-pin SSOP, 2.95mm × 4.00mm body, 0.65mm pitch, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCCA | Supply rail for A-side I/Os | Powers A1/A2 outputs and sets their logic-high voltage; accepts 1.2–3.6V |
| 2 A1 | Data I/O (A port) | Bidirectional signal path; output level tracks VCCA, input threshold references VCCA |
| 3 A2 | Data I/O (A port) | Identical function to A1; supports dual-bit parallel translation |
| 4 GND | Ground reference | Common return for both supply rails; required for bus-hold and Ioff functionality |
| 5 DIR | Direction control input | Referenced to VCCA; low = B→A, high = A→B; no OE pin required |
| 6 B2 | Data I/O (B port) | Bidirectional signal path; output level tracks VCCB, input threshold references VCCB |
| 7 B1 | Data I/O (B port) | Identical function to B2; completes 2-bit transceiver pair |
| 8 VCCB | Supply rail for B-side I/Os | Powers B1/B2 outputs and sets their logic-high voltage; accepts 1.2–3.6V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail level shifting | Independent VCCA/VCCB supplies enable simultaneous 1.2V↔3.3V translation without external components |
| Active bus-hold | Maintains stable logic state on unterminated A1/A2/B1/B2 pins - eliminates board space and BOM cost of pull resistors |
| VCC isolation | Forces high-Z on both ports if either VCCA or VCCB = GND - prevents false logic injection during power sequencing |
| Partial power-down (Ioff) | Blocks back-current when one rail is off - critical for hot-swap and dynamic power gating in servers and notebooks |
| NanoFree™ packaging | DCT package uses die-as-package construction - reduces footprint by >40% vs. standard SSOP, improves thermal resistance |
Applications
| Mobile Baseband Interface | Server Memory Subsystem |
|---|---|
Use Scenario: Interfacing an application processor (1.8V I/O) with a 3.3V PMIC or audio codec in a smartphone. IC Role / Device Role / Timing Role: Bidirectional level shifter managing control/data lines (e.g., I²C, GPIO) between voltage domains. Use Value: Eliminates discrete resistor networks and saves >1.2mm² PCB area per channel while supporting 500Mbps burst transfers. | Use Scenario: Bridging DDR4 memory controller (1.2V) and SPD EEPROM (2.5V) in enterprise storage servers. IC Role / Device Role / Timing Role: Asynchronous 2-bit translator for serial presence detect (SPD) data reads during boot. Use Value: Ensures reliable read-after-write timing with <2.5ns propagation delay and withstands 4.6V transient spikes on EEPROM side. |
| Notebook Display Link | Industrial PLC I/O Module |
Use Scenario: Connecting eDP transmitter (1.8V) to panel timing controller (3.3V) in ultrabook displays. IC Role / Device Role / Timing Role: Direction-controlled transceiver for AUX CH and HPD signaling lines. Use Value: DIR pin simplifies firmware control versus OE-based alternatives; bus-hold prevents floating HPD glitches during sleep/resume. | Use Scenario: Isolating field-side 24V digital inputs (level-shifted to 3.3V) from 1.8V FPGA logic in programmable logic controllers. IC Role / Device Role / Timing Role: Robust level translator with ±8kV HBM ESD protection for harsh industrial environments. Use Value: 4.6V I/O tolerance absorbs induced transients; Ioff prevents backfeed during field-power brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2T45DCTRG4 | Lower max data rate (420Mbps), no bus-hold, 3.6V max VCC only | Suitable for cost-sensitive consumer designs where bus-hold is not required | Select when 1.2V–3.6V dual-rail flexibility is needed but 500Mbps and bus-hold are optional |
| TXS0102DCUR | Auto-direction sensing (no DIR pin), higher ICC, 1.65–3.6V VCCA/VCCB range | Better for I²C/SMBus where direction is data-dependent; less suitable for GPIO/control lines | Choose for bidirectional serial buses needing zero-firmware direction control; avoid for deterministic DIR-driven paths |
Compared with SN74LVC2T45DCTRG4 and TXS0102DCUR, the 74AVCH2T45DCTTG4 uniquely combines 500Mbps speed, active bus-hold, full 1.2V–3.6V dual-rail support, and VCC isolation - making it optimal for high-reliability, space-constrained mobile and server I/O bridging where power sequencing and floating inputs are design constraints.
Availability
74AVCH2T45DCTTG4 is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory subsystems, notebook display links, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 74AVCH2T45DCTTG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74AVCH2T45 product line delivers configurable dual-supply transceivers optimized for low-voltage, high-density portable and computing systems requiring robust level-shifting, power sequencing resilience, and minimal board area.
FAQ
What voltage ranges does the 74AVCH2T45DCTTG4 support on its VCCA and VCCB supplies?
The 74AVCH2T45DCTTG4 supports independent supply voltages from 1.2V to 3.6V on both VCCA and VCCB pins. This enables translation between any combination of standard low-voltage domains including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V - verified across all operating conditions in TI's SCES582I datasheet.
How does the DIR pin control data direction in the 74AVCH2T45DCTTG4?
The DIR pin on the 74AVCH2T45DCTTG4 is referenced to VCCA: a logic low (≤0.35×VCCA) enables data flow from B-port to A-port, while a logic high (≥0.65×VCCA) enables A-port to B-port transmission. No external pull-up/down is needed - the internal bus-hold maintains valid state when DIR is un-driven.
Does the 74AVCH2T45DCTTG4 require external pull-up or pull-down resistors on its data lines?
No. The 74AVCH2T45DCTTG4 integrates active bus-hold circuitry on all four data I/Os (A1, A2, B1, B2), which maintains valid logic states on un-driven or floating lines. TI explicitly advises against adding external pull resistors, as they conflict with bus-hold operation and degrade noise margin.
What is the maximum data rate supported by the 74AVCH2T45DCTTG4, and under what conditions?
The 74AVCH2T45DCTTG4 achieves up to 500Mbps when translating from 1.8V (VCCA) to 3.3V (VCCB). Lower rates apply for other combinations: 320Mbps (<1.8V→3.3V), 320Mbps (→2.5V/1.8V), 280Mbps (→1.5V), and 240Mbps (→1.2V), all specified in the official TI datasheet SCES582I.
How does VCC isolation function in the 74AVCH2T45DCTTG4 during power sequencing?
VCC isolation in the 74AVCH2T45DCTTG4 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down), both A-port and B-port outputs immediately enter high-impedance state - preventing false logic assertion on either bus. This behavior is guaranteed across –40°C to +85°C and requires no external circuitry.
74AVCH2T45DCTTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.2 V ~ 3.6 V
- Voltage - VCCB:
- 1.2 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 500Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
74AVCH2T45DCTTG4 FAQ
1.How can I place an order for 74AVCH2T45DCTTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AVCH2T45DCTTG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74AVCH2T45DCTTG4 reliable?
The price and inventory of 74AVCH2T45DCTTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AVCH2T45DCTTG4 is usually 5 days.
3.What payment methods are accepted for 74AVCH2T45DCTTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AVCH2T45DCTTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AVCH2T45DCTTG4?
74AVCH2T45DCTTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AVCH2T45DCTTG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74AVCH2T45DCTTG4?
For technical support, including 74AVCH2T45DCTTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AVCH2T45DCTTG4 requirements.
6.How does Aetrix verify that 74AVCH2T45DCTTG4 is sourced from the original manufacturer or authorized distributors?
All 74AVCH2T45DCTTG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74AVCH2T45DCTTG4 meets industry standards.
7.What is the process for return or replacement of 74AVCH2T45DCTTG4?
All 74AVCH2T45DCTTG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AVCH2T45DCTTG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74AVCH2T45DCTTG4 part is unused and in its original packaging.
Return procedure for 74AVCH2T45DCTTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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